​A Detroit man who allegedly bought high-grade explosives from an undercover agent after amassing an arsenal of weapons and talking about carrying out an attack was charged Monday following an FBI counterterrorism investigation. It is unclear from court filings whether Sebastian Gregerson, aka Abdurrahman Bin Mikaayl, was planning an attack and why he allegedly was purchasing explosives from an undercover FBI agent. Court records chronicle a 16-month undercover investigation that started after a tipster told the FBI that Gregerson, 29, had grenades and bazookas. The complaint emerged Monday amid heightened concern about terror-related attacks and fatal shootings of law enforcement officers, including five officers killed during an attack last month in Dallas. “I am unable to comment beyond what’s contained in the complaint,” said Gina Balaya, spokeswoman for the U.S. Attorney’s Office in Detroit. Gregerson, who has a long brown beard and nearly waist-length hair, quietly read a copy of the criminal complaint Monday while wearing handcuffs and ankle chains during a brief arraignment in federal court. He faces up to 10 years in federal prison if convicted of unregistered possession of a destructive device and unlicensed receipt of explosive materials. Once again we have proof that the ISIS problem exist in America, but look at that the FBI actually did their job for a change. The fact is this isn't the only ISIS supporter and Islamic terrorist who is currently living in the United States, and the Obama administration continues to let these people into our country secretly in mass through the Federal refugee resettlement program. Detroit is one of the major hot beds for ISIS supporters and fighters to settle in America, due to the suburb of Dearborn, MI turning into one of Americas largest Muslim communities. This man obviously had a large attack planned due to his choice of grenades and rocket launchers as his choice of weapons, so he likely had help and his accomplices are likely running around the Detroit area freely.